php - How do I update the value from a checkbox into MySQL -

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my form form method="post">

input type="checkbox" name="facebook" value="yes">

submit

so, want is:

a) if checkbox checked, want update appropriate field yes

b) if checkbox unchecked, want update field no

$_post['chk_ans'] return when being checked,

if (isset($_post['chk_ans'])) {  ..update query here ..  }

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